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gstreamer/gst-libs/gst/rtsp/gstrtspconnection.c
Wim Taymans 88110ea67e rtsp: use fully qualified urls when using a proxy 
Use a fully qualified url when specifying the url for tunneled requests through
a proxy.
See #573173
2009-04-02 22:28:55 +02:00

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/* GStreamer
* Copyright (C) <2005,2006> Wim Taymans <wim@fluendo.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Unless otherwise indicated, Source Code is licensed under MIT license.
* See further explanation attached in License Statement (distributed in the file
* LICENSE).
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/**
* SECTION:gstrtspconnection
* @short_description: manage RTSP connections
* @see_also: gstrtspurl
*
* <refsect2>
* <para>
* This object manages the RTSP connection to the server. It provides function
* to receive and send bytes and messages.
* </para>
* </refsect2>
*
* Last reviewed on 2007-07-24 (0.10.14)
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
/* we include this here to get the G_OS_* defines */
#include <glib.h>
#include <gst/gst.h>
#ifdef G_OS_WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#define EINPROGRESS WSAEINPROGRESS
#else
#include <sys/ioctl.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#endif
#ifdef HAVE_FIONREAD_IN_SYS_FILIO
#include <sys/filio.h>
#endif
#include "gstrtspconnection.h"
#include "gstrtspbase64.h"
#include "md5.h"
typedef struct
{
gint state;
guint save;
gchar in[4];
guint cin;
gchar out[3];
guint cout;
guint coutl;
} DecodeCtx;
static GstRTSPResult read_line (gint fd, guint8 * buffer, guint * idx,
guint size, DecodeCtx * ctxp);
static GstRTSPResult parse_key_value (guint8 * buffer, gchar * key,
guint keysize, gchar ** value);
static void parse_string (gchar * dest, gint size, gchar ** src);
#ifdef G_OS_WIN32
#define READ_SOCKET(fd, buf, len) recv (fd, (char *)buf, len, 0)
#define WRITE_SOCKET(fd, buf, len) send (fd, (const char *)buf, len, 0)
#define SETSOCKOPT(sock, level, name, val, len) setsockopt (sock, level, name, (const char *)val, len)
#define CLOSE_SOCKET(sock) closesocket (sock)
#define ERRNO_IS_EAGAIN (WSAGetLastError () == WSAEWOULDBLOCK)
#define ERRNO_IS_EINTR (WSAGetLastError () == WSAEINTR)
/* According to Microsoft's connect() documentation this one returns
* WSAEWOULDBLOCK and not WSAEINPROGRESS. */
#define ERRNO_IS_EINPROGRESS (WSAGetLastError () == WSAEWOULDBLOCK)
#else
#define READ_SOCKET(fd, buf, len) read (fd, buf, len)
#define WRITE_SOCKET(fd, buf, len) write (fd, buf, len)
#define SETSOCKOPT(sock, level, name, val, len) setsockopt (sock, level, name, val, len)
#define CLOSE_SOCKET(sock) close (sock)
#define ERRNO_IS_EAGAIN (errno == EAGAIN)
#define ERRNO_IS_EINTR (errno == EINTR)
#define ERRNO_IS_EINPROGRESS (errno == EINPROGRESS)
#endif
#define ADD_POLLFD(fdset, pfd, fd) \
G_STMT_START { \
(pfd)->fd = fd; \
gst_poll_add_fd (fdset, pfd); \
} G_STMT_END
#define REMOVE_POLLFD(fdset, pfd) \
G_STMT_START { \
if ((pfd)->fd != -1) { \
GST_DEBUG ("remove fd %d", (pfd)->fd); \
gst_poll_remove_fd (fdset, pfd); \
CLOSE_SOCKET ((pfd)->fd); \
(pfd)->fd = -1; \
} \
} G_STMT_END
typedef enum
{
TUNNEL_STATE_NONE,
TUNNEL_STATE_GET,
TUNNEL_STATE_POST,
TUNNEL_STATE_COMPLETE
} GstRTSPTunnelState;
#define TUNNELID_LEN 24
struct _GstRTSPConnection
{
/*< private > */
/* URL for the connection */
GstRTSPUrl *url;
/* connection state */
GstPollFD fd0;
GstPollFD fd1;
GstPollFD *readfd;
GstPollFD *writefd;
gchar tunnelid[TUNNELID_LEN];
gboolean tunneled;
GstRTSPTunnelState tstate;
GstPoll *fdset;
gchar *ip;
/* Session state */
gint cseq; /* sequence number */
gchar session_id[512]; /* session id */
gint timeout; /* session timeout in seconds */
GTimer *timer; /* timeout timer */
/* Authentication */
GstRTSPAuthMethod auth_method;
gchar *username;
gchar *passwd;
GHashTable *auth_params;
DecodeCtx ctx;
DecodeCtx *ctxp;
gchar *proxy_host;
guint proxy_port;
};
#ifdef G_OS_WIN32
static int
inet_aton (const char *c, struct in_addr *paddr)
{
/* note that inet_addr is deprecated on unix because
* inet_addr returns -1 (INADDR_NONE) for the valid 255.255.255.255
* address. */
paddr->s_addr = inet_addr (c);
if (paddr->s_addr == INADDR_NONE)
return 0;
return 1;
}
#endif
enum
{
STATE_START = 0,
STATE_DATA_HEADER,
STATE_DATA_BODY,
STATE_READ_LINES,
STATE_END,
STATE_LAST
};
/* a structure for constructing RTSPMessages */
typedef struct
{
gint state;
guint8 buffer[4096];
guint offset;
guint line;
guint8 *body_data;
glong body_len;
} GstRTSPBuilder;
static void
build_reset (GstRTSPBuilder * builder)
{
g_free (builder->body_data);
memset (builder, 0, sizeof (GstRTSPBuilder));
}
/**
* gst_rtsp_connection_create:
* @url: a #GstRTSPUrl
* @conn: storage for a #GstRTSPConnection
*
* Create a newly allocated #GstRTSPConnection from @url and store it in @conn.
* The connection will not yet attempt to connect to @url, use
* gst_rtsp_connection_connect().
*
* A copy of @url will be made.
*
* Returns: #GST_RTSP_OK when @conn contains a valid connection.
*/
GstRTSPResult
gst_rtsp_connection_create (const GstRTSPUrl * url, GstRTSPConnection ** conn)
{
GstRTSPConnection *newconn;
#ifdef G_OS_WIN32
WSADATA w;
int error;
#endif
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
#ifdef G_OS_WIN32
error = WSAStartup (0x0202, &w);
if (error)
goto startup_error;
if (w.wVersion != 0x0202)
goto version_error;
#endif
newconn = g_new0 (GstRTSPConnection, 1);
if ((newconn->fdset = gst_poll_new (TRUE)) == NULL)
goto no_fdset;
newconn->url = gst_rtsp_url_copy (url);
newconn->fd0.fd = -1;
newconn->fd1.fd = -1;
newconn->timer = g_timer_new ();
newconn->timeout = 60;
newconn->cseq = 1;
newconn->auth_method = GST_RTSP_AUTH_NONE;
newconn->username = NULL;
newconn->passwd = NULL;
newconn->auth_params = NULL;
*conn = newconn;
return GST_RTSP_OK;
/* ERRORS */
#ifdef G_OS_WIN32
startup_error:
{
g_warning ("Error %d on WSAStartup", error);
return GST_RTSP_EWSASTART;
}
version_error:
{
g_warning ("Windows sockets are not version 0x202 (current 0x%x)",
w.wVersion);
WSACleanup ();
return GST_RTSP_EWSAVERSION;
}
#endif
no_fdset:
{
g_free (newconn);
#ifdef G_OS_WIN32
WSACleanup ();
#endif
return GST_RTSP_ESYS;
}
}
/**
* gst_rtsp_connection_accept:
* @sock: a socket
* @conn: storage for a #GstRTSPConnection
*
* Accept a new connection on @sock and create a new #GstRTSPConnection for
* handling communication on new socket.
*
* Returns: #GST_RTSP_OK when @conn contains a valid connection.
*
* Since: 0.10.23
*/
GstRTSPResult
gst_rtsp_connection_accept (gint sock, GstRTSPConnection ** conn)
{
int fd;
unsigned int address_len;
GstRTSPConnection *newconn = NULL;
struct sockaddr_in address;
GstRTSPUrl *url;
#ifdef G_OS_WIN32
gulong flags = 1;
#endif
address_len = sizeof (address);
memset (&address, 0, address_len);
#ifndef G_OS_WIN32
fd = accept (sock, (struct sockaddr *) &address, &address_len);
#else
fd = accept (sock, (struct sockaddr *) &address, (gint *) & address_len);
#endif /* G_OS_WIN32 */
if (fd == -1)
goto accept_failed;
/* set to non-blocking mode so that we can cancel the communication */
#ifndef G_OS_WIN32
fcntl (fd, F_SETFL, O_NONBLOCK);
#else
ioctlsocket (fd, FIONBIO, &flags);
#endif /* G_OS_WIN32 */
/* create a url for the client address */
url = g_new0 (GstRTSPUrl, 1);
url->host = g_strdup_printf ("%s", inet_ntoa (address.sin_addr));
url->port = address.sin_port;
/* now create the connection object */
gst_rtsp_connection_create (url, &newconn);
gst_rtsp_url_free (url);
ADD_POLLFD (newconn->fdset, &newconn->fd0, fd);
/* both read and write initially */
newconn->readfd = &newconn->fd0;
newconn->writefd = &newconn->fd0;
*conn = newconn;
return GST_RTSP_OK;
/* ERRORS */
accept_failed:
{
return GST_RTSP_ESYS;
}
}
static gchar *
do_resolve (const gchar * host)
{
struct hostent *hostinfo;
struct in_addr addr;
const gchar *ip;
#ifdef G_OS_WIN32
struct in_addr *addrp;
#else
char **addrs;
gchar ipbuf[INET_ADDRSTRLEN];
#endif /* G_OS_WIN32 */
ip = NULL;
/* first check if it already is an IP address */
if (inet_aton (host, &addr)) {
ip = host;
} else {
hostinfo = gethostbyname (host);
if (!hostinfo)
goto not_resolved; /* h_errno set */
if (hostinfo->h_addrtype != AF_INET)
goto not_ip; /* host not an IP host */
#ifdef G_OS_WIN32
addrp = (struct in_addr *) hostinfo->h_addr_list[0];
/* this is not threadsafe */
ip = inet_ntoa (*addrp);
#else
addrs = hostinfo->h_addr_list;
ip = inet_ntop (AF_INET, (struct in_addr *) addrs[0], ipbuf,
sizeof (ipbuf));
#endif /* G_OS_WIN32 */
}
return g_strdup (ip);
/* ERRORS */
not_resolved:
{
GST_ERROR ("could not resolve %s", host);
return NULL;
}
not_ip:
{
GST_ERROR ("not an IP address");
return NULL;
}
}
static GstRTSPResult
do_connect (const gchar * ip, guint16 port, GstPollFD * fdout,
GstPoll * fdset, GTimeVal * timeout)
{
gint fd;
struct sockaddr_in sa_in;
gint ret;
#ifdef G_OS_WIN32
unsigned long flags = 1;
#endif /* G_OS_WIN32 */
GstClockTime to;
gint retval;
memset (&sa_in, 0, sizeof (sa_in));
sa_in.sin_family = AF_INET; /* network socket */
sa_in.sin_port = htons (port); /* on port */
sa_in.sin_addr.s_addr = inet_addr (ip); /* on host ip */
fd = socket (AF_INET, SOCK_STREAM, 0);
if (fd == -1)
goto no_socket;
/* set to non-blocking mode so that we can cancel the connect */
#ifndef G_OS_WIN32
fcntl (fd, F_SETFL, O_NONBLOCK);
#else
ioctlsocket (fd, FIONBIO, &flags);
#endif /* G_OS_WIN32 */
/* add the socket to our fdset */
ADD_POLLFD (fdset, fdout, fd);
/* we are going to connect ASYNC now */
ret = connect (fd, (struct sockaddr *) &sa_in, sizeof (sa_in));
if (ret == 0)
goto done;
if (!ERRNO_IS_EINPROGRESS)
goto sys_error;
/* wait for connect to complete up to the specified timeout or until we got
* interrupted. */
gst_poll_fd_ctl_write (fdset, fdout, TRUE);
to = timeout ? GST_TIMEVAL_TO_TIME (*timeout) : GST_CLOCK_TIME_NONE;
do {
retval = gst_poll_wait (fdset, to);
} while (retval == -1 && (errno == EINTR || errno == EAGAIN));
if (retval == 0)
goto timeout;
else if (retval == -1)
goto sys_error;
/* we can still have an error connecting on windows */
if (gst_poll_fd_has_error (fdset, fdout)) {
socklen_t len = sizeof (errno);
#ifndef G_OS_WIN32
getsockopt (fd, SOL_SOCKET, SO_ERROR, &errno, &len);
#else
getsockopt (fd, SOL_SOCKET, SO_ERROR, (char *) &errno, &len);
#endif
goto sys_error;
}
gst_poll_fd_ignored (fdset, fdout);
done:
return GST_RTSP_OK;
/* ERRORS */
no_socket:
{
GST_ERROR ("no socket %d (%s)", errno, g_strerror (errno));
return GST_RTSP_ESYS;
}
sys_error:
{
GST_ERROR ("system error %d (%s)", errno, g_strerror (errno));
REMOVE_POLLFD (fdset, fdout);
return GST_RTSP_ESYS;
}
timeout:
{
GST_ERROR ("timeout");
REMOVE_POLLFD (fdset, fdout);
return GST_RTSP_ETIMEOUT;
}
}
static GstRTSPResult
setup_tunneling (GstRTSPConnection * conn, GTimeVal * timeout)
{
gint i;
GstRTSPResult res;
gchar *str;
guint idx, line;
gint retval;
GstClockTime to;
gchar *ip, *url_port_str;
guint16 port, url_port;
gchar codestr[4], *resultstr;
gint code;
GstRTSPUrl *url;
gchar *hostparam;
/* create a random sessionid */
for (i = 0; i < TUNNELID_LEN; i++)
conn->tunnelid[i] = g_random_int_range ('a', 'z');
conn->tunnelid[TUNNELID_LEN - 1] = '\0';
url = conn->url;
/* get the port from the url */
gst_rtsp_url_get_port (url, &url_port);
if (conn->proxy_host) {
hostparam = g_strdup_printf ("Host: %s:%d\r\n", url->host, url_port);
url_port_str = g_strdup_printf (":%d", url_port);
ip = conn->proxy_host;
port = conn->proxy_port;
} else {
hostparam = NULL;
url_port_str = NULL;
ip = conn->ip;
port = url_port;
}
/* */
str = g_strdup_printf ("GET %s%s%s%s%s%s HTTP/1.0\r\n"
"%s"
"x-sessioncookie: %s\r\n"
"Accept: application/x-rtsp-tunnelled\r\n"
"Pragma: no-cache\r\n"
"Cache-Control: no-cache\r\n" "\r\n",
conn->proxy_host ? "http://" : "",
conn->proxy_host ? url->host : "",
conn->proxy_host ? url_port_str : "",
url->abspath, url->query ? "?" : "", url->query ? url->query : "",
hostparam ? hostparam : "", conn->tunnelid);
/* we start by writing to this fd */
conn->writefd = &conn->fd0;
res = gst_rtsp_connection_write (conn, (guint8 *) str, strlen (str), timeout);
g_free (str);
if (res != GST_RTSP_OK)
goto write_failed;
gst_poll_fd_ctl_write (conn->fdset, &conn->fd0, FALSE);
gst_poll_fd_ctl_read (conn->fdset, &conn->fd0, TRUE);
to = timeout ? GST_TIMEVAL_TO_TIME (*timeout) : GST_CLOCK_TIME_NONE;
line = 0;
while (TRUE) {
guint8 buffer[4096];
idx = 0;
while (TRUE) {
res = read_line (conn->fd0.fd, buffer, &idx, sizeof (buffer), NULL);
if (res == GST_RTSP_EEOF)
goto eof;
if (res == GST_RTSP_OK)
break;
if (res != GST_RTSP_EINTR)
goto read_error;
do {
retval = gst_poll_wait (conn->fdset, to);
} while (retval == -1 && (errno == EINTR || errno == EAGAIN));
/* check for timeout */
if (retval == 0)
goto timeout;
if (retval == -1) {
if (errno == EBUSY)
goto stopped;
else
goto select_error;
}
}
/* check for last line */
if (buffer[0] == '\r')
buffer[0] = '\0';
if (buffer[0] == '\0')
break;
if (line == 0) {
/* first line, parse response */
gchar versionstr[20];
gchar *bptr;
bptr = (gchar *) buffer;
parse_string (versionstr, sizeof (versionstr), &bptr);
parse_string (codestr, sizeof (codestr), &bptr);
code = atoi (codestr);
while (g_ascii_isspace (*bptr))
bptr++;
resultstr = bptr;
if (code != 200)
goto wrong_result;
} else {
gchar key[32];
gchar *value;
/* other lines, parse key/value */
res = parse_key_value (buffer, key, sizeof (key), &value);
if (res == GST_RTSP_OK) {
/* we got a new ip address */
if (g_ascii_strcasecmp (key, "x-server-ip-address") == 0) {
if (conn->proxy_host) {
/* if we use a proxy we need to change the destination url */
g_free (url->host);
url->host = g_strdup (value);
g_free (hostparam);
g_free (url_port_str);
hostparam =
g_strdup_printf ("Host: %s:%d\r\n", url->host, url_port);
url_port_str = g_strdup_printf (":%d", url_port);
} else {
/* and resolve the new ip address */
if (!(ip = do_resolve (conn->ip)))
goto not_resolved;
g_free (conn->ip);
conn->ip = ip;
}
}
}
}
line++;
}
/* connect to the host/port */
res = do_connect (ip, port, &conn->fd1, conn->fdset, timeout);
if (res != GST_RTSP_OK)
goto connect_failed;
/* this is now our writing socket */
conn->writefd = &conn->fd1;
/* */
str = g_strdup_printf ("POST %s%s%s%s%s%s HTTP/1.0\r\n"
"%s"
"x-sessioncookie: %s\r\n"
"Content-Type: application/x-rtsp-tunnelled\r\n"
"Pragma: no-cache\r\n"
"Cache-Control: no-cache\r\n"
"Content-Length: 32767\r\n"
"Expires: Sun, 9 Jan 1972 00:00:00 GMT\r\n"
"\r\n",
conn->proxy_host ? "http://" : "",
conn->proxy_host ? url->host : "",
conn->proxy_host ? url_port_str : "",
url->abspath, url->query ? "?" : "", url->query ? url->query : "",
hostparam ? hostparam : "", conn->tunnelid);
/* we start by writing to this fd */
conn->writefd = &conn->fd1;
res = gst_rtsp_connection_write (conn, (guint8 *) str, strlen (str), timeout);
g_free (str);
if (res != GST_RTSP_OK)
goto write_failed;
exit:
g_free (hostparam);
g_free (url_port_str);
return res;
/* ERRORS */
write_failed:
{
GST_ERROR ("write failed (%d)", res);
goto exit;
}
eof:
{
res = GST_RTSP_EEOF;
goto exit;
}
read_error:
{
goto exit;
}
timeout:
{
res = GST_RTSP_ETIMEOUT;
goto exit;
}
select_error:
{
res = GST_RTSP_ESYS;
goto exit;
}
stopped:
{
res = GST_RTSP_EINTR;
goto exit;
}
wrong_result:
{
GST_ERROR ("got failure response %d %s", code, resultstr);
res = GST_RTSP_ERROR;
goto exit;
}
not_resolved:
{
GST_ERROR ("could not resolve %s", conn->ip);
res = GST_RTSP_ENET;
goto exit;
}
connect_failed:
{
GST_ERROR ("failed to connect");
goto exit;
}
}
/**
* gst_rtsp_connection_connect:
* @conn: a #GstRTSPConnection
* @timeout: a #GTimeVal timeout
*
* Attempt to connect to the url of @conn made with
* gst_rtsp_connection_create(). If @timeout is #NULL this function can block
* forever. If @timeout contains a valid timeout, this function will return
* #GST_RTSP_ETIMEOUT after the timeout expired.
*
* This function can be cancelled with gst_rtsp_connection_flush().
*
* Returns: #GST_RTSP_OK when a connection could be made.
*/
GstRTSPResult
gst_rtsp_connection_connect (GstRTSPConnection * conn, GTimeVal * timeout)
{
GstRTSPResult res;
gchar *ip;
guint16 port;
GstRTSPUrl *url;
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (conn->url != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (conn->fd0.fd < 0, GST_RTSP_EINVAL);
url = conn->url;
if (conn->proxy_host && conn->tunneled) {
if (!(ip = do_resolve (conn->proxy_host))) {
GST_ERROR ("could not resolve %s", conn->proxy_host);
goto not_resolved;
}
port = conn->proxy_port;
g_free (conn->proxy_host);
conn->proxy_host = ip;
} else {
if (!(ip = do_resolve (url->host))) {
GST_ERROR ("could not resolve %s", url->host);
goto not_resolved;
}
/* get the port from the url */
gst_rtsp_url_get_port (url, &port);
g_free (conn->ip);
conn->ip = ip;
}
/* connect to the host/port */
res = do_connect (ip, port, &conn->fd0, conn->fdset, timeout);
if (res != GST_RTSP_OK)
goto connect_failed;
/* this is our read URL */
conn->readfd = &conn->fd0;
if (conn->tunneled) {
res = setup_tunneling (conn, timeout);
if (res != GST_RTSP_OK)
goto tunneling_failed;
} else {
conn->writefd = &conn->fd0;
}
return GST_RTSP_OK;
not_resolved:
{
return GST_RTSP_ENET;
}
connect_failed:
{
GST_ERROR ("failed to connect");
return res;
}
tunneling_failed:
{
GST_ERROR ("failed to setup tunneling");
return res;
}
}
static void
md5_digest_to_hex_string (unsigned char digest[16], char string[33])
{
static const char hexdigits[] = "0123456789abcdef";
int i;
for (i = 0; i < 16; i++) {
string[i * 2] = hexdigits[(digest[i] >> 4) & 0x0f];
string[i * 2 + 1] = hexdigits[digest[i] & 0x0f];
}
string[32] = 0;
}
static void
auth_digest_compute_hex_urp (const gchar * username,
const gchar * realm, const gchar * password, gchar hex_urp[33])
{
struct MD5Context md5_context;
unsigned char digest[16];
MD5Init (&md5_context);
MD5Update (&md5_context, username, strlen (username));
MD5Update (&md5_context, ":", 1);
MD5Update (&md5_context, realm, strlen (realm));
MD5Update (&md5_context, ":", 1);
MD5Update (&md5_context, password, strlen (password));
MD5Final (digest, &md5_context);
md5_digest_to_hex_string (digest, hex_urp);
}
static void
auth_digest_compute_response (const gchar * method,
const gchar * uri, const gchar * hex_a1, const gchar * nonce,
gchar response[33])
{
char hex_a2[33];
struct MD5Context md5_context;
unsigned char digest[16];
/* compute A2 */
MD5Init (&md5_context);
MD5Update (&md5_context, method, strlen (method));
MD5Update (&md5_context, ":", 1);
MD5Update (&md5_context, uri, strlen (uri));
MD5Final (digest, &md5_context);
md5_digest_to_hex_string (digest, hex_a2);
/* compute KD */
MD5Init (&md5_context);
MD5Update (&md5_context, hex_a1, strlen (hex_a1));
MD5Update (&md5_context, ":", 1);
MD5Update (&md5_context, nonce, strlen (nonce));
MD5Update (&md5_context, ":", 1);
MD5Update (&md5_context, hex_a2, 32);
MD5Final (digest, &md5_context);
md5_digest_to_hex_string (digest, response);
}
static void
add_auth_header (GstRTSPConnection * conn, GstRTSPMessage * message)
{
switch (conn->auth_method) {
case GST_RTSP_AUTH_BASIC:{
gchar *user_pass;
gchar *user_pass64;
gchar *auth_string;
user_pass = g_strdup_printf ("%s:%s", conn->username, conn->passwd);
user_pass64 = g_base64_encode ((guchar *) user_pass, strlen (user_pass));
auth_string = g_strdup_printf ("Basic %s", user_pass64);
gst_rtsp_message_take_header (message, GST_RTSP_HDR_AUTHORIZATION,
auth_string);
g_free (user_pass);
g_free (user_pass64);
break;
}
case GST_RTSP_AUTH_DIGEST:{
gchar response[33], hex_urp[33];
gchar *auth_string, *auth_string2;
gchar *realm;
gchar *nonce;
gchar *opaque;
const gchar *uri;
const gchar *method;
/* we need to have some params set */
if (conn->auth_params == NULL)
break;
/* we need the realm and nonce */
realm = (gchar *) g_hash_table_lookup (conn->auth_params, "realm");
nonce = (gchar *) g_hash_table_lookup (conn->auth_params, "nonce");
if (realm == NULL || nonce == NULL)
break;
auth_digest_compute_hex_urp (conn->username, realm, conn->passwd,
hex_urp);
method = gst_rtsp_method_as_text (message->type_data.request.method);
uri = message->type_data.request.uri;
/* Assume no qop, algorithm=md5, stale=false */
/* For algorithm MD5, a1 = urp. */
auth_digest_compute_response (method, uri, hex_urp, nonce, response);
auth_string = g_strdup_printf ("Digest username=\"%s\", "
"realm=\"%s\", nonce=\"%s\", uri=\"%s\", response=\"%s\"",
conn->username, realm, nonce, uri, response);
opaque = (gchar *) g_hash_table_lookup (conn->auth_params, "opaque");
if (opaque) {
auth_string2 = g_strdup_printf ("%s, opaque=\"%s\"", auth_string,
opaque);
g_free (auth_string);
auth_string = auth_string2;
}
gst_rtsp_message_take_header (message, GST_RTSP_HDR_AUTHORIZATION,
auth_string);
break;
}
default:
/* Nothing to do */
break;
}
}
static void
gen_date_string (gchar * date_string, guint len)
{
GTimeVal tv;
time_t t;
#ifdef HAVE_GMTIME_R
struct tm tm_;
#endif
g_get_current_time (&tv);
t = (time_t) tv.tv_sec;
#ifdef HAVE_GMTIME_R
strftime (date_string, len, "%a, %d %b %Y %H:%M:%S GMT", gmtime_r (&t, &tm_));
#else
strftime (date_string, len, "%a, %d %b %Y %H:%M:%S GMT", gmtime (&t));
#endif
}
static GstRTSPResult
write_bytes (gint fd, const guint8 * buffer, guint * idx, guint size)
{
guint left;
if (*idx > size)
return GST_RTSP_ERROR;
left = size - *idx;
while (left) {
gint r;
r = WRITE_SOCKET (fd, &buffer[*idx], left);
if (r == 0) {
return GST_RTSP_EINTR;
} else if (r < 0) {
if (ERRNO_IS_EAGAIN)
return GST_RTSP_EINTR;
if (!ERRNO_IS_EINTR)
return GST_RTSP_ESYS;
} else {
left -= r;
*idx += r;
}
}
return GST_RTSP_OK;
}
static gint
fill_bytes (gint fd, guint8 * buffer, guint size, DecodeCtx * ctx)
{
gint out = 0;
if (ctx) {
gint r;
while (size > 0) {
while (size > 0 && ctx->cout < ctx->coutl) {
/* we have some leftover bytes */
*buffer++ = ctx->out[ctx->cout];
ctx->cout++;
size--;
out++;
}
/* nothing in the buffer */
if (size == 0)
break;
/* try to read more bytes */
r = READ_SOCKET (fd, &ctx->in[ctx->cin], 4 - ctx->cin);
if (r <= 0) {
if (out == 0)
out = r;
break;
}
ctx->cin += r;
if (ctx->cin == 4) {
r = g_base64_decode_step ((const gchar *) ctx->in, 4,
(guchar *) ctx->out, &ctx->state, &ctx->save);
ctx->cout = 0;
ctx->coutl = r;
ctx->cin = 0;
}
}
} else {
out = READ_SOCKET (fd, buffer, size);
}
return out;
}
static GstRTSPResult
read_bytes (gint fd, guint8 * buffer, guint * idx, guint size, DecodeCtx * ctx)
{
guint left;
if (*idx > size)
return GST_RTSP_ERROR;
left = size - *idx;
while (left) {
gint r;
r = fill_bytes (fd, &buffer[*idx], left, ctx);
if (r == 0) {
return GST_RTSP_EEOF;
} else if (r < 0) {
if (ERRNO_IS_EAGAIN)
return GST_RTSP_EINTR;
if (!ERRNO_IS_EINTR)
return GST_RTSP_ESYS;
} else {
left -= r;
*idx += r;
}
}
return GST_RTSP_OK;
}
static GstRTSPResult
read_line (gint fd, guint8 * buffer, guint * idx, guint size, DecodeCtx * ctx)
{
while (TRUE) {
guint8 c;
gint r;
r = fill_bytes (fd, &c, 1, ctx);
if (r == 0) {
return GST_RTSP_EEOF;
} else if (r < 0) {
if (ERRNO_IS_EAGAIN)
return GST_RTSP_EINTR;
if (!ERRNO_IS_EINTR)
return GST_RTSP_ESYS;
} else {
if (c == '\n') /* end on \n */
break;
if (c == '\r') /* ignore \r */
continue;
if (*idx < size - 1)
buffer[(*idx)++] = c;
}
}
buffer[*idx] = '\0';
return GST_RTSP_OK;
}
/**
* gst_rtsp_connection_write:
* @conn: a #GstRTSPConnection
* @data: the data to write
* @size: the size of @data
* @timeout: a timeout value or #NULL
*
* Attempt to write @size bytes of @data to the connected @conn, blocking up to
* the specified @timeout. @timeout can be #NULL, in which case this function
* might block forever.
*
* This function can be cancelled with gst_rtsp_connection_flush().
*
* Returns: #GST_RTSP_OK on success.
*/
GstRTSPResult
gst_rtsp_connection_write (GstRTSPConnection * conn, const guint8 * data,
guint size, GTimeVal * timeout)
{
guint offset;
gint retval;
GstClockTime to;
GstRTSPResult res;
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (data != NULL || size == 0, GST_RTSP_EINVAL);
g_return_val_if_fail (conn->writefd != NULL, GST_RTSP_EINVAL);
gst_poll_set_controllable (conn->fdset, TRUE);
gst_poll_fd_ctl_write (conn->fdset, conn->writefd, TRUE);
gst_poll_fd_ctl_read (conn->fdset, conn->readfd, FALSE);
/* clear all previous poll results */
gst_poll_fd_ignored (conn->fdset, conn->writefd);
gst_poll_fd_ignored (conn->fdset, conn->readfd);
to = timeout ? GST_TIMEVAL_TO_TIME (*timeout) : GST_CLOCK_TIME_NONE;
offset = 0;
while (TRUE) {
/* try to write */
res = write_bytes (conn->writefd->fd, data, &offset, size);
if (res == GST_RTSP_OK)
break;
if (res != GST_RTSP_EINTR)
goto write_error;
/* not all is written, wait until we can write more */
do {
retval = gst_poll_wait (conn->fdset, to);
} while (retval == -1 && (errno == EINTR || errno == EAGAIN));
if (retval == 0)
goto timeout;
if (retval == -1) {
if (errno == EBUSY)
goto stopped;
else
goto select_error;
}
}
return GST_RTSP_OK;
/* ERRORS */
timeout:
{
return GST_RTSP_ETIMEOUT;
}
select_error:
{
return GST_RTSP_ESYS;
}
stopped:
{
return GST_RTSP_EINTR;
}
write_error:
{
return res;
}
}
static GString *
message_to_string (GstRTSPConnection * conn, GstRTSPMessage * message)
{
GString *str = NULL;
str = g_string_new ("");
switch (message->type) {
case GST_RTSP_MESSAGE_REQUEST:
/* create request string, add CSeq */
g_string_append_printf (str, "%s %s RTSP/1.0\r\n"
"CSeq: %d\r\n",
gst_rtsp_method_as_text (message->type_data.request.method),
message->type_data.request.uri, conn->cseq++);
/* add session id if we have one */
if (conn->session_id[0] != '\0') {
gst_rtsp_message_add_header (message, GST_RTSP_HDR_SESSION,
conn->session_id);
}
/* add any authentication headers */
add_auth_header (conn, message);
break;
case GST_RTSP_MESSAGE_RESPONSE:
/* create response string */
g_string_append_printf (str, "RTSP/1.0 %d %s\r\n",
message->type_data.response.code, message->type_data.response.reason);
break;
case GST_RTSP_MESSAGE_DATA:
{
guint8 data_header[4];
/* prepare data header */
data_header[0] = '$';
data_header[1] = message->type_data.data.channel;
data_header[2] = (message->body_size >> 8) & 0xff;
data_header[3] = message->body_size & 0xff;
/* create string with header and data */
str = g_string_append_len (str, (gchar *) data_header, 4);
str =
g_string_append_len (str, (gchar *) message->body,
message->body_size);
break;
}
default:
g_string_free (str, TRUE);
g_return_val_if_reached (NULL);
break;
}
/* append headers and body */
if (message->type != GST_RTSP_MESSAGE_DATA) {
gchar date_string[100];
gen_date_string (date_string, sizeof (date_string));
/* add date header */
gst_rtsp_message_add_header (message, GST_RTSP_HDR_DATE, date_string);
/* append headers */
gst_rtsp_message_append_headers (message, str);
/* append Content-Length and body if needed */
if (message->body != NULL && message->body_size > 0) {
gchar *len;
len = g_strdup_printf ("%d", message->body_size);
g_string_append_printf (str, "%s: %s\r\n",
gst_rtsp_header_as_text (GST_RTSP_HDR_CONTENT_LENGTH), len);
g_free (len);
/* header ends here */
g_string_append (str, "\r\n");
str =
g_string_append_len (str, (gchar *) message->body,
message->body_size);
} else {
/* just end headers */
g_string_append (str, "\r\n");
}
}
return str;
}
/**
* gst_rtsp_connection_send:
* @conn: a #GstRTSPConnection
* @message: the message to send
* @timeout: a timeout value or #NULL
*
* Attempt to send @message to the connected @conn, blocking up to
* the specified @timeout. @timeout can be #NULL, in which case this function
* might block forever.
*
* This function can be cancelled with gst_rtsp_connection_flush().
*
* Returns: #GST_RTSP_OK on success.
*/
GstRTSPResult
gst_rtsp_connection_send (GstRTSPConnection * conn, GstRTSPMessage * message,
GTimeVal * timeout)
{
GString *string = NULL;
GstRTSPResult res;
gchar *str;
gsize len;
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (message != NULL, GST_RTSP_EINVAL);
if (!(string = message_to_string (conn, message)))
goto no_message;
if (conn->tunneled) {
str = g_base64_encode ((const guchar *) string->str, string->len);
g_string_free (string, TRUE);
len = strlen (str);
} else {
str = string->str;
len = string->len;
g_string_free (string, FALSE);
}
/* write request */
res = gst_rtsp_connection_write (conn, (guint8 *) str, len, timeout);
g_free (str);
return res;
no_message:
{
g_warning ("Wrong message");
return GST_RTSP_EINVAL;
}
}
static void
parse_string (gchar * dest, gint size, gchar ** src)
{
gint idx;
idx = 0;
/* skip spaces */
while (g_ascii_isspace (**src))
(*src)++;
while (!g_ascii_isspace (**src) && **src != '\0') {
if (idx < size - 1)
dest[idx++] = **src;
(*src)++;
}
if (size > 0)
dest[idx] = '\0';
}
static void
parse_key (gchar * dest, gint size, gchar ** src)
{
gint idx;
idx = 0;
while (**src != ':' && **src != '\0') {
if (idx < size - 1)
dest[idx++] = **src;
(*src)++;
}
if (size > 0)
dest[idx] = '\0';
}
static GstRTSPResult
parse_response_status (guint8 * buffer, GstRTSPMessage * msg)
{
GstRTSPResult res;
gchar versionstr[20];
gchar codestr[4];
gint code;
gchar *bptr;
bptr = (gchar *) buffer;
parse_string (versionstr, sizeof (versionstr), &bptr);
parse_string (codestr, sizeof (codestr), &bptr);
code = atoi (codestr);
while (g_ascii_isspace (*bptr))
bptr++;
if (strcmp (versionstr, "RTSP/1.0") == 0)
GST_RTSP_CHECK (gst_rtsp_message_init_response (msg, code, bptr, NULL),
parse_error);
else if (strncmp (versionstr, "RTSP/", 5) == 0) {
GST_RTSP_CHECK (gst_rtsp_message_init_response (msg, code, bptr, NULL),
parse_error);
msg->type_data.response.version = GST_RTSP_VERSION_INVALID;
} else
goto parse_error;
return GST_RTSP_OK;
parse_error:
{
return GST_RTSP_EPARSE;
}
}
static GstRTSPResult
parse_request_line (GstRTSPConnection * conn, guint8 * buffer,
GstRTSPMessage * msg)
{
GstRTSPResult res = GST_RTSP_OK;
gchar versionstr[20];
gchar methodstr[20];
gchar urlstr[4096];
gchar *bptr;
GstRTSPMethod method;
GstRTSPTunnelState tstate = TUNNEL_STATE_NONE;
bptr = (gchar *) buffer;
parse_string (methodstr, sizeof (methodstr), &bptr);
method = gst_rtsp_find_method (methodstr);
if (method == GST_RTSP_INVALID) {
/* a tunnel request is allowed when we don't have one yet */
if (conn->tstate != TUNNEL_STATE_NONE)
goto invalid_method;
/* we need GET or POST for a valid tunnel request */
if (!strcmp (methodstr, "GET"))
tstate = TUNNEL_STATE_GET;
else if (!strcmp (methodstr, "POST"))
tstate = TUNNEL_STATE_POST;
else
goto invalid_method;
}
parse_string (urlstr, sizeof (urlstr), &bptr);
if (*urlstr == '\0')
goto invalid_url;
parse_string (versionstr, sizeof (versionstr), &bptr);
if (*bptr != '\0')
goto invalid_version;
if (strcmp (versionstr, "RTSP/1.0") == 0) {
res = gst_rtsp_message_init_request (msg, method, urlstr);
} else if (strncmp (versionstr, "RTSP/", 5) == 0) {
res = gst_rtsp_message_init_request (msg, method, urlstr);
msg->type_data.request.version = GST_RTSP_VERSION_INVALID;
} else if (strcmp (versionstr, "HTTP/1.0") == 0) {
/* tunnel request, we need a tunnel method */
if (tstate == TUNNEL_STATE_NONE) {
res = GST_RTSP_EPARSE;
} else {
conn->tstate = tstate;
}
} else {
res = GST_RTSP_EPARSE;
}
return res;
/* ERRORS */
invalid_method:
{
GST_ERROR ("invalid method %s", methodstr);
return GST_RTSP_EPARSE;
}
invalid_url:
{
GST_ERROR ("invalid url %s", urlstr);
return GST_RTSP_EPARSE;
}
invalid_version:
{
GST_ERROR ("invalid version");
return GST_RTSP_EPARSE;
}
}
static GstRTSPResult
parse_key_value (guint8 * buffer, gchar * key, guint keysize, gchar ** value)
{
gchar *bptr;
bptr = (gchar *) buffer;
/* read key */
parse_key (key, keysize, &bptr);
if (*bptr != ':')
goto no_column;
bptr++;
while (g_ascii_isspace (*bptr))
bptr++;
*value = bptr;
return GST_RTSP_OK;
/* ERRORS */
no_column:
{
return GST_RTSP_EPARSE;
}
}
/* parsing lines means reading a Key: Value pair */
static GstRTSPResult
parse_line (GstRTSPConnection * conn, guint8 * buffer, GstRTSPMessage * msg)
{
GstRTSPResult res;
gchar key[32];
gchar *value;
GstRTSPHeaderField field;
res = parse_key_value (buffer, key, sizeof (key), &value);
if (res != GST_RTSP_OK)
goto parse_error;
if (conn->tstate == TUNNEL_STATE_GET || conn->tstate == TUNNEL_STATE_POST) {
/* save the tunnel session in the connection */
if (!strcmp (key, "x-sessioncookie")) {
strncpy (conn->tunnelid, value, TUNNELID_LEN);
conn->tunnelid[TUNNELID_LEN - 1] = '\0';
conn->tunneled = TRUE;
}
} else {
field = gst_rtsp_find_header_field (key);
if (field != GST_RTSP_HDR_INVALID)
gst_rtsp_message_add_header (msg, field, value);
}
return GST_RTSP_OK;
/* ERRORS */
parse_error:
{
return res;
}
}
/* returns:
* GST_RTSP_OK when a complete message was read.
* GST_RTSP_EEOF: when the socket is closed
* GST_RTSP_EINTR: when more data is needed.
* GST_RTSP_..: some other error occured.
*/
static GstRTSPResult
build_next (GstRTSPBuilder * builder, GstRTSPMessage * message,
GstRTSPConnection * conn)
{
GstRTSPResult res;
while (TRUE) {
switch (builder->state) {
case STATE_START:
builder->offset = 0;
res =
read_bytes (conn->readfd->fd, (guint8 *) builder->buffer,
&builder->offset, 1, conn->ctxp);
if (res != GST_RTSP_OK)
goto done;
/* we have 1 bytes now and we can see if this is a data message or
* not */
if (builder->buffer[0] == '$') {
/* data message, prepare for the header */
builder->state = STATE_DATA_HEADER;
} else {
builder->line = 0;
builder->state = STATE_READ_LINES;
}
break;
case STATE_DATA_HEADER:
{
res =
read_bytes (conn->readfd->fd, (guint8 *) builder->buffer,
&builder->offset, 4, conn->ctxp);
if (res != GST_RTSP_OK)
goto done;
gst_rtsp_message_init_data (message, builder->buffer[1]);
builder->body_len = (builder->buffer[2] << 8) | builder->buffer[3];
builder->body_data = g_malloc (builder->body_len + 1);
builder->body_data[builder->body_len] = '\0';
builder->offset = 0;
builder->state = STATE_DATA_BODY;
break;
}
case STATE_DATA_BODY:
{
res =
read_bytes (conn->readfd->fd, builder->body_data, &builder->offset,
builder->body_len, conn->ctxp);
if (res != GST_RTSP_OK)
goto done;
/* we have the complete body now, store in the message adjusting the
* length to include the traling '\0' */
gst_rtsp_message_take_body (message,
(guint8 *) builder->body_data, builder->body_len + 1);
builder->body_data = NULL;
builder->body_len = 0;
builder->state = STATE_END;
break;
}
case STATE_READ_LINES:
{
res = read_line (conn->readfd->fd, builder->buffer, &builder->offset,
sizeof (builder->buffer), conn->ctxp);
if (res != GST_RTSP_OK)
goto done;
/* we have a regular response */
if (builder->buffer[0] == '\r') {
builder->buffer[0] = '\0';
}
if (builder->buffer[0] == '\0') {
gchar *hdrval;
/* empty line, end of message header */
/* see if there is a Content-Length header */
if (gst_rtsp_message_get_header (message,
GST_RTSP_HDR_CONTENT_LENGTH, &hdrval, 0) == GST_RTSP_OK) {
/* there is, prepare to read the body */
builder->body_len = atol (hdrval);
builder->body_data = g_malloc (builder->body_len + 1);
builder->body_data[builder->body_len] = '\0';
builder->offset = 0;
builder->state = STATE_DATA_BODY;
} else {
builder->state = STATE_END;
}
break;
}
/* we have a line */
if (builder->line == 0) {
/* first line, check for response status */
if (memcmp (builder->buffer, "RTSP", 4) == 0) {
res = parse_response_status (builder->buffer, message);
} else {
res = parse_request_line (conn, builder->buffer, message);
}
/* the first line must parse without errors */
if (res != GST_RTSP_OK)
goto done;
} else {
/* else just parse the line, ignore errors */
parse_line (conn, builder->buffer, message);
}
builder->line++;
builder->offset = 0;
break;
}
case STATE_END:
{
gchar *session_id;
if (conn->tstate == TUNNEL_STATE_GET) {
res = GST_RTSP_ETGET;
goto done;
} else if (conn->tstate == TUNNEL_STATE_POST) {
res = GST_RTSP_ETPOST;
goto done;
}
if (message->type == GST_RTSP_MESSAGE_DATA) {
/* data messages don't have headers */
res = GST_RTSP_OK;
goto done;
}
/* save session id in the connection for further use */
if (gst_rtsp_message_get_header (message, GST_RTSP_HDR_SESSION,
&session_id, 0) == GST_RTSP_OK) {
gint maxlen, i;
maxlen = sizeof (conn->session_id) - 1;
/* the sessionid can have attributes marked with ;
* Make sure we strip them */
for (i = 0; session_id[i] != '\0'; i++) {
if (session_id[i] == ';') {
maxlen = i;
/* parse timeout */
do {
i++;
} while (g_ascii_isspace (session_id[i]));
if (g_str_has_prefix (&session_id[i], "timeout=")) {
gint to;
/* if we parsed something valid, configure */
if ((to = atoi (&session_id[i + 8])) > 0)
conn->timeout = to;
}
break;
}
}
/* make sure to not overflow */
strncpy (conn->session_id, session_id, maxlen);
conn->session_id[maxlen] = '\0';
}
res = GST_RTSP_OK;
goto done;
}
default:
res = GST_RTSP_ERROR;
break;
}
}
done:
return res;
}
/**
* gst_rtsp_connection_read:
* @conn: a #GstRTSPConnection
* @data: the data to read
* @size: the size of @data
* @timeout: a timeout value or #NULL
*
* Attempt to read @size bytes into @data from the connected @conn, blocking up to
* the specified @timeout. @timeout can be #NULL, in which case this function
* might block forever.
*
* This function can be cancelled with gst_rtsp_connection_flush().
*
* Returns: #GST_RTSP_OK on success.
*/
GstRTSPResult
gst_rtsp_connection_read (GstRTSPConnection * conn, guint8 * data, guint size,
GTimeVal * timeout)
{
guint offset;
gint retval;
GstClockTime to;
GstRTSPResult res;
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (data != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (conn->readfd != NULL, GST_RTSP_EINVAL);
if (size == 0)
return GST_RTSP_OK;
offset = 0;
/* configure timeout if any */
to = timeout ? GST_TIMEVAL_TO_TIME (*timeout) : GST_CLOCK_TIME_NONE;
gst_poll_set_controllable (conn->fdset, TRUE);
gst_poll_fd_ctl_write (conn->fdset, conn->writefd, FALSE);
gst_poll_fd_ctl_read (conn->fdset, conn->readfd, TRUE);
while (TRUE) {
res = read_bytes (conn->readfd->fd, data, &offset, size, conn->ctxp);
if (res == GST_RTSP_EEOF)
goto eof;
if (res == GST_RTSP_OK)
break;
if (res != GST_RTSP_EINTR)
goto read_error;
do {
retval = gst_poll_wait (conn->fdset, to);
} while (retval == -1 && (errno == EINTR || errno == EAGAIN));
/* check for timeout */
if (retval == 0)
goto select_timeout;
if (retval == -1) {
if (errno == EBUSY)
goto stopped;
else
goto select_error;
}
gst_poll_set_controllable (conn->fdset, FALSE);
}
return GST_RTSP_OK;
/* ERRORS */
select_error:
{
return GST_RTSP_ESYS;
}
select_timeout:
{
return GST_RTSP_ETIMEOUT;
}
stopped:
{
return GST_RTSP_EINTR;
}
eof:
{
return GST_RTSP_EEOF;
}
read_error:
{
return res;
}
}
static GString *
gen_tunnel_reply (GstRTSPConnection * conn, GstRTSPStatusCode code)
{
GString *str;
gchar date_string[100];
const gchar *status;
gen_date_string (date_string, sizeof (date_string));
status = gst_rtsp_status_as_text (code);
if (status == NULL) {
code = 500;
status = "Internal Server Error";
}
str = g_string_new ("");
/* */
g_string_append_printf (str, "HTTP/1.0 %d %s\r\n", code, status);
g_string_append_printf (str,
"Server: GStreamer RTSP Server\r\n"
"Date: %s\r\n"
"Connection: close\r\n"
"Cache-Control: no-store\r\n" "Pragma: no-cache\r\n", date_string);
if (code == 200) {
if (conn->ip)
g_string_append_printf (str, "x-server-ip-address: %s\r\n", conn->ip);
g_string_append_printf (str,
"Content-Type: application/x-rtsp-tunnelled\r\n" "\r\n");
}
return str;
}
/**
* gst_rtsp_connection_receive:
* @conn: a #GstRTSPConnection
* @message: the message to read
* @timeout: a timeout value or #NULL
*
* Attempt to read into @message from the connected @conn, blocking up to
* the specified @timeout. @timeout can be #NULL, in which case this function
* might block forever.
*
* This function can be cancelled with gst_rtsp_connection_flush().
*
* Returns: #GST_RTSP_OK on success.
*/
GstRTSPResult
gst_rtsp_connection_receive (GstRTSPConnection * conn, GstRTSPMessage * message,
GTimeVal * timeout)
{
GstRTSPResult res;
GstRTSPBuilder builder = { 0 };
gint retval;
GstClockTime to;
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (message != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (conn->readfd != NULL, GST_RTSP_EINVAL);
/* configure timeout if any */
to = timeout ? GST_TIMEVAL_TO_TIME (*timeout) : GST_CLOCK_TIME_NONE;
gst_poll_set_controllable (conn->fdset, TRUE);
gst_poll_fd_ctl_write (conn->fdset, conn->writefd, FALSE);
gst_poll_fd_ctl_read (conn->fdset, conn->readfd, TRUE);
while (TRUE) {
res = build_next (&builder, message, conn);
if (res == GST_RTSP_EEOF)
goto eof;
if (res == GST_RTSP_OK)
break;
if (res == GST_RTSP_ETGET) {
GString *str;
/* tunnel GET request, we can reply now */
str = gen_tunnel_reply (conn, GST_RTSP_STS_OK);
res =
gst_rtsp_connection_write (conn, (guint8 *) str->str, str->len,
timeout);
g_string_free (str, TRUE);
} else if (res == GST_RTSP_ETPOST) {
/* tunnel POST request, return the value, the caller now has to link the
* two connections. */
break;
} else if (res != GST_RTSP_EINTR)
goto read_error;
do {
retval = gst_poll_wait (conn->fdset, to);
} while (retval == -1 && (errno == EINTR || errno == EAGAIN));
/* check for timeout */
if (retval == 0)
goto select_timeout;
if (retval == -1) {
if (errno == EBUSY)
goto stopped;
else
goto select_error;
}
gst_poll_set_controllable (conn->fdset, FALSE);
}
/* we have a message here */
build_reset (&builder);
return GST_RTSP_OK;
/* ERRORS */
select_error:
{
res = GST_RTSP_ESYS;
goto cleanup;
}
select_timeout:
{
res = GST_RTSP_ETIMEOUT;
goto cleanup;
}
stopped:
{
res = GST_RTSP_EINTR;
goto cleanup;
}
eof:
{
res = GST_RTSP_EEOF;
goto cleanup;
}
read_error:
cleanup:
{
build_reset (&builder);
gst_rtsp_message_unset (message);
return res;
}
}
/**
* gst_rtsp_connection_close:
* @conn: a #GstRTSPConnection
*
* Close the connected @conn. After this call, the connection is in the same
* state as when it was first created.
*
* Returns: #GST_RTSP_OK on success.
*/
GstRTSPResult
gst_rtsp_connection_close (GstRTSPConnection * conn)
{
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
g_free (conn->ip);
conn->ip = NULL;
REMOVE_POLLFD (conn->fdset, &conn->fd0);
REMOVE_POLLFD (conn->fdset, &conn->fd1);
conn->writefd = NULL;
conn->readfd = NULL;
conn->tunneled = FALSE;
conn->tstate = TUNNEL_STATE_NONE;
conn->ctxp = NULL;
g_free (conn->username);
conn->username = NULL;
g_free (conn->passwd);
conn->passwd = NULL;
gst_rtsp_connection_clear_auth_params (conn);
conn->timeout = 60;
conn->cseq = 0;
conn->session_id[0] = '\0';
return GST_RTSP_OK;
}
/**
* gst_rtsp_connection_free:
* @conn: a #GstRTSPConnection
*
* Close and free @conn.
*
* Returns: #GST_RTSP_OK on success.
*/
GstRTSPResult
gst_rtsp_connection_free (GstRTSPConnection * conn)
{
GstRTSPResult res;
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
res = gst_rtsp_connection_close (conn);
gst_poll_free (conn->fdset);
g_timer_destroy (conn->timer);
gst_rtsp_url_free (conn->url);
g_free (conn->proxy_host);
g_free (conn);
#ifdef G_OS_WIN32
WSACleanup ();
#endif
return res;
}
/**
* gst_rtsp_connection_poll:
* @conn: a #GstRTSPConnection
* @events: a bitmask of #GstRTSPEvent flags to check
* @revents: location for result flags
* @timeout: a timeout
*
* Wait up to the specified @timeout for the connection to become available for
* at least one of the operations specified in @events. When the function returns
* with #GST_RTSP_OK, @revents will contain a bitmask of available operations on
* @conn.
*
* @timeout can be #NULL, in which case this function might block forever.
*
* This function can be cancelled with gst_rtsp_connection_flush().
*
* Returns: #GST_RTSP_OK on success.
*
* Since: 0.10.15
*/
GstRTSPResult
gst_rtsp_connection_poll (GstRTSPConnection * conn, GstRTSPEvent events,
GstRTSPEvent * revents, GTimeVal * timeout)
{
GstClockTime to;
gint retval;
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (events != 0, GST_RTSP_EINVAL);
g_return_val_if_fail (revents != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (conn->readfd != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (conn->writefd != NULL, GST_RTSP_EINVAL);
gst_poll_set_controllable (conn->fdset, TRUE);
/* add fd to writer set when asked to */
gst_poll_fd_ctl_write (conn->fdset, conn->writefd,
events & GST_RTSP_EV_WRITE);
/* add fd to reader set when asked to */
gst_poll_fd_ctl_read (conn->fdset, conn->readfd, events & GST_RTSP_EV_READ);
/* configure timeout if any */
to = timeout ? GST_TIMEVAL_TO_TIME (*timeout) : GST_CLOCK_TIME_NONE;
do {
retval = gst_poll_wait (conn->fdset, to);
} while (retval == -1 && (errno == EINTR || errno == EAGAIN));
if (retval == 0)
goto select_timeout;
if (retval == -1) {
if (errno == EBUSY)
goto stopped;
else
goto select_error;
}
*revents = 0;
if (events & GST_RTSP_EV_READ) {
if (gst_poll_fd_can_read (conn->fdset, conn->readfd))
*revents |= GST_RTSP_EV_READ;
}
if (events & GST_RTSP_EV_WRITE) {
if (gst_poll_fd_can_write (conn->fdset, conn->writefd))
*revents |= GST_RTSP_EV_WRITE;
}
return GST_RTSP_OK;
/* ERRORS */
select_timeout:
{
return GST_RTSP_ETIMEOUT;
}
select_error:
{
return GST_RTSP_ESYS;
}
stopped:
{
return GST_RTSP_EINTR;
}
}
/**
* gst_rtsp_connection_next_timeout:
* @conn: a #GstRTSPConnection
* @timeout: a timeout
*
* Calculate the next timeout for @conn, storing the result in @timeout.
*
* Returns: #GST_RTSP_OK.
*/
GstRTSPResult
gst_rtsp_connection_next_timeout (GstRTSPConnection * conn, GTimeVal * timeout)
{
gdouble elapsed;
glong sec;
gulong usec;
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (timeout != NULL, GST_RTSP_EINVAL);
elapsed = g_timer_elapsed (conn->timer, &usec);
if (elapsed >= conn->timeout) {
sec = 0;
usec = 0;
} else {
sec = conn->timeout - elapsed;
}
timeout->tv_sec = sec;
timeout->tv_usec = usec;
return GST_RTSP_OK;
}
/**
* gst_rtsp_connection_reset_timeout:
* @conn: a #GstRTSPConnection
*
* Reset the timeout of @conn.
*
* Returns: #GST_RTSP_OK.
*/
GstRTSPResult
gst_rtsp_connection_reset_timeout (GstRTSPConnection * conn)
{
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
g_timer_start (conn->timer);
return GST_RTSP_OK;
}
/**
* gst_rtsp_connection_flush:
* @conn: a #GstRTSPConnection
* @flush: start or stop the flush
*
* Start or stop the flushing action on @conn. When flushing, all current
* and future actions on @conn will return #GST_RTSP_EINTR until the connection
* is set to non-flushing mode again.
*
* Returns: #GST_RTSP_OK.
*/
GstRTSPResult
gst_rtsp_connection_flush (GstRTSPConnection * conn, gboolean flush)
{
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
gst_poll_set_flushing (conn->fdset, flush);
return GST_RTSP_OK;
}
/**
* gst_rtsp_connection_set_proxy:
* @conn: a #GstRTSPConnection
* @host: the proxy host
* @port: the proxy port
*
* Set the proxy host and port.
*
* Returns: #GST_RTSP_OK.
*
* Since: 0.10.23
*/
GstRTSPResult
gst_rtsp_connection_set_proxy (GstRTSPConnection * conn,
const gchar * host, guint port)
{
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
g_free (conn->proxy_host);
conn->proxy_host = g_strdup (host);
conn->proxy_port = port;
return GST_RTSP_OK;
}
/**
* gst_rtsp_connection_set_auth:
* @conn: a #GstRTSPConnection
* @method: authentication method
* @user: the user
* @pass: the password
*
* Configure @conn for authentication mode @method with @user and @pass as the
* user and password respectively.
*
* Returns: #GST_RTSP_OK.
*/
GstRTSPResult
gst_rtsp_connection_set_auth (GstRTSPConnection * conn,
GstRTSPAuthMethod method, const gchar * user, const gchar * pass)
{
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
if (method == GST_RTSP_AUTH_DIGEST && ((user == NULL || pass == NULL)
|| g_strrstr (user, ":") != NULL))
return GST_RTSP_EINVAL;
/* Make sure the username and passwd are being set for authentication */
if (method == GST_RTSP_AUTH_NONE && (user == NULL || pass == NULL))
return GST_RTSP_EINVAL;
/* ":" chars are not allowed in usernames for basic auth */
if (method == GST_RTSP_AUTH_BASIC && g_strrstr (user, ":") != NULL)
return GST_RTSP_EINVAL;
g_free (conn->username);
g_free (conn->passwd);
conn->auth_method = method;
conn->username = g_strdup (user);
conn->passwd = g_strdup (pass);
return GST_RTSP_OK;
}
/**
* str_case_hash:
* @key: ASCII string to hash
*
* Hashes @key in a case-insensitive manner.
*
* Returns: the hash code.
**/
static guint
str_case_hash (gconstpointer key)
{
const char *p = key;
guint h = g_ascii_toupper (*p);
if (h)
for (p += 1; *p != '\0'; p++)
h = (h << 5) - h + g_ascii_toupper (*p);
return h;
}
/**
* str_case_equal:
* @v1: an ASCII string
* @v2: another ASCII string
*
* Compares @v1 and @v2 in a case-insensitive manner
*
* Returns: %TRUE if they are equal (modulo case)
**/
static gboolean
str_case_equal (gconstpointer v1, gconstpointer v2)
{
const char *string1 = v1;
const char *string2 = v2;
return g_ascii_strcasecmp (string1, string2) == 0;
}
/**
* gst_rtsp_connection_set_auth_param:
* @conn: a #GstRTSPConnection
* @param: authentication directive
* @value: value
*
* Setup @conn with authentication directives. This is not necesary for
* methods #GST_RTSP_AUTH_NONE and #GST_RTSP_AUTH_BASIC. For
* #GST_RTSP_AUTH_DIGEST, directives should be taken from the digest challenge
* in the WWW-Authenticate response header and can include realm, domain,
* nonce, opaque, stale, algorithm, qop as per RFC2617.
*
* Since: 0.10.20
*/
void
gst_rtsp_connection_set_auth_param (GstRTSPConnection * conn,
const gchar * param, const gchar * value)
{
g_return_if_fail (conn != NULL);
g_return_if_fail (param != NULL);
if (conn->auth_params == NULL) {
conn->auth_params =
g_hash_table_new_full (str_case_hash, str_case_equal, g_free, g_free);
}
g_hash_table_insert (conn->auth_params, g_strdup (param), g_strdup (value));
}
/**
* gst_rtsp_connection_clear_auth_params:
* @conn: a #GstRTSPConnection
*
* Clear the list of authentication directives stored in @conn.
*
* Since: 0.10.20
*/
void
gst_rtsp_connection_clear_auth_params (GstRTSPConnection * conn)
{
g_return_if_fail (conn != NULL);
if (conn->auth_params != NULL) {
g_hash_table_destroy (conn->auth_params);
conn->auth_params = NULL;
}
}
static GstRTSPResult
set_qos_dscp (gint fd, guint qos_dscp)
{
union gst_sockaddr
{
struct sockaddr sa;
struct sockaddr_in6 sa_in6;
struct sockaddr_storage sa_stor;
} sa;
socklen_t slen = sizeof (sa);
gint af;
gint tos;
if (fd == -1)
return GST_RTSP_OK;
if (getsockname (fd, &sa.sa, &slen) < 0)
goto no_getsockname;
af = sa.sa.sa_family;
/* if this is an IPv4-mapped address then do IPv4 QoS */
if (af == AF_INET6) {
if (IN6_IS_ADDR_V4MAPPED (&sa.sa_in6.sin6_addr))
af = AF_INET;
}
/* extract and shift 6 bits of the DSCP */
tos = (qos_dscp & 0x3f) << 2;
switch (af) {
case AF_INET:
if (SETSOCKOPT (fd, IPPROTO_IP, IP_TOS, &tos, sizeof (tos)) < 0)
goto no_setsockopt;
break;
case AF_INET6:
#ifdef IPV6_TCLASS
if (SETSOCKOPT (fd, IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof (tos)) < 0)
goto no_setsockopt;
break;
#endif
default:
goto wrong_family;
}
return GST_RTSP_OK;
/* ERRORS */
no_getsockname:
no_setsockopt:
{
return GST_RTSP_ESYS;
}
wrong_family:
{
return GST_RTSP_ERROR;
}
}
/**
* gst_rtsp_connection_set_qos_dscp:
* @conn: a #GstRTSPConnection
* @qos_dscp: DSCP value
*
* Configure @conn to use the specified DSCP value.
*
* Returns: #GST_RTSP_OK on success.
*
* Since: 0.10.20
*/
GstRTSPResult
gst_rtsp_connection_set_qos_dscp (GstRTSPConnection * conn, guint qos_dscp)
{
GstRTSPResult res;
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (conn->readfd != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (conn->writefd != NULL, GST_RTSP_EINVAL);
res = set_qos_dscp (conn->fd0.fd, qos_dscp);
if (res == GST_RTSP_OK)
res = set_qos_dscp (conn->fd1.fd, qos_dscp);
return res;
}
/**
* gst_rtsp_connection_get_url:
* @conn: a #GstRTSPConnection
*
* Retrieve the URL of the other end of @conn.
*
* Returns: The URL. This value remains valid until the
* connection is freed.
*
* Since: 0.10.23
*/
GstRTSPUrl *
gst_rtsp_connection_get_url (const GstRTSPConnection * conn)
{
g_return_val_if_fail (conn != NULL, NULL);
return conn->url;
}
/**
* gst_rtsp_connection_get_ip:
* @conn: a #GstRTSPConnection
*
* Retrieve the IP address of the other end of @conn.
*
* Returns: The IP address as a string. this value remains valid until the
* connection is closed.
*
* Since: 0.10.20
*/
const gchar *
gst_rtsp_connection_get_ip (const GstRTSPConnection * conn)
{
g_return_val_if_fail (conn != NULL, NULL);
return conn->ip;
}
/**
* gst_rtsp_connection_set_ip:
* @conn: a #GstRTSPConnection
* @ip: an ip address
*
* Set the IP address of the server.
*
* Since: 0.10.23
*/
void
gst_rtsp_connection_set_ip (GstRTSPConnection * conn, const gchar * ip)
{
g_return_if_fail (conn != NULL);
g_free (conn->ip);
conn->ip = g_strdup (ip);
}
/**
* gst_rtsp_connection_get_readfd:
* @conn: a #GstRTSPConnection
*
* Get the file descriptor for reading.
*
* Returns: the file descriptor used for reading or -1 on error. The file
* descriptor remains valid until the connection is closed.
*
* Since: 0.10.23
*/
gint
gst_rtsp_connection_get_readfd (const GstRTSPConnection * conn)
{
g_return_val_if_fail (conn != NULL, -1);
g_return_val_if_fail (conn->readfd != NULL, -1);
return conn->readfd->fd;
}
/**
* gst_rtsp_connection_get_writefd:
* @conn: a #GstRTSPConnection
*
* Get the file descriptor for writing.
*
* Returns: the file descriptor used for writing or -1 on error. The file
* descriptor remains valid until the connection is closed.
*
* Since: 0.10.23
*/
gint
gst_rtsp_connection_get_writefd (const GstRTSPConnection * conn)
{
g_return_val_if_fail (conn != NULL, -1);
g_return_val_if_fail (conn->writefd != NULL, -1);
return conn->writefd->fd;
}
/**
* gst_rtsp_connection_set_tunneled:
* @conn: a #GstRTSPConnection
* @tunneled: the new state
*
* Set the HTTP tunneling state of the connection. This must be configured before
* the @conn is connected.
*
* Since: 0.10.23
*/
void
gst_rtsp_connection_set_tunneled (GstRTSPConnection * conn, gboolean tunneled)
{
g_return_if_fail (conn != NULL);
g_return_if_fail (conn->readfd == NULL);
g_return_if_fail (conn->writefd == NULL);
conn->tunneled = tunneled;
}
/**
* gst_rtsp_connection_is_tunneled:
* @conn: a #GstRTSPConnection
*
* Get the tunneling state of the connection.
*
* Returns: if @conn is using HTTP tunneling.
*
* Since: 0.10.23
*/
gboolean
gst_rtsp_connection_is_tunneled (const GstRTSPConnection * conn)
{
g_return_val_if_fail (conn != NULL, FALSE);
return conn->tunneled;
}
/**
* gst_rtsp_connection_get_tunnelid:
* @conn: a #GstRTSPConnection
*
* Get the tunnel session id the connection.
*
* Returns: returns a non-empty string if @conn is being tunneled over HTTP.
*
* Since: 0.10.23
*/
const gchar *
gst_rtsp_connection_get_tunnelid (const GstRTSPConnection * conn)
{
g_return_val_if_fail (conn != NULL, NULL);
if (!conn->tunneled)
return NULL;
return conn->tunnelid;
}
/**
* gst_rtsp_connection_do_tunnel:
* @conn: a #GstRTSPConnection
* @conn2: a #GstRTSPConnection
*
* If @conn received the first tunnel connection and @conn2 received
* the second tunnel connection, link the two connections together so that
* @conn manages the tunneled connection.
*
* After this call, @conn2 cannot be used anymore and must be freed with
* gst_rtsp_connection_free().
*
* Returns: return GST_RTSP_OK on success.
*
* Since: 0.10.23
*/
GstRTSPResult
gst_rtsp_connection_do_tunnel (GstRTSPConnection * conn,
GstRTSPConnection * conn2)
{
g_return_val_if_fail (conn != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (conn2 != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (conn->tstate == TUNNEL_STATE_GET, GST_RTSP_EINVAL);
g_return_val_if_fail (conn2->tstate == TUNNEL_STATE_POST, GST_RTSP_EINVAL);
g_return_val_if_fail (!memcmp (conn2->tunnelid, conn->tunnelid, TUNNELID_LEN),
GST_RTSP_EINVAL);
/* both connections have fd0 as the read/write socket. start by taking the
* socket from conn2 and set it as the socket in conn */
conn->fd1 = conn2->fd0;
/* clean up some of the state of conn2 */
gst_poll_remove_fd (conn2->fdset, &conn2->fd0);
conn2->fd0.fd = -1;
conn2->readfd = conn2->writefd = NULL;
/* We make fd0 the write socket and fd1 the read socket. */
conn->writefd = &conn->fd0;
conn->readfd = &conn->fd1;
conn->tstate = TUNNEL_STATE_COMPLETE;
/* we need base64 decoding for the readfd */
conn->ctx.state = 0;
conn->ctx.cin = 0;
conn->ctx.cout = 3;
conn->ctx.save = 0;
conn->ctxp = &conn->ctx;
return GST_RTSP_OK;
}
#define READ_COND (G_IO_IN | G_IO_HUP | G_IO_ERR)
#define WRITE_COND (G_IO_OUT | G_IO_ERR)
typedef struct
{
GString *str;
guint cseq;
} GstRTSPRec;
static GstRTSPRec *queue_response (GstRTSPWatch * watch, GString * str,
guint cseq);
/* async functions */
struct _GstRTSPWatch
{
GSource source;
GstRTSPConnection *conn;
GstRTSPBuilder builder;
GstRTSPMessage message;
GPollFD readfd;
GPollFD writefd;
gboolean write_added;
/* queued message for transmission */
GAsyncQueue *messages;
guint8 *write_data;
guint write_off;
guint write_len;
guint write_cseq;
GstRTSPWatchFuncs funcs;
gpointer user_data;
GDestroyNotify notify;
};
static gboolean
gst_rtsp_source_prepare (GSource * source, gint * timeout)
{
GstRTSPWatch *watch = (GstRTSPWatch *) source;
*timeout = (watch->conn->timeout * 1000);
return FALSE;
}
static gboolean
gst_rtsp_source_check (GSource * source)
{
GstRTSPWatch *watch = (GstRTSPWatch *) source;
if (watch->readfd.revents & READ_COND)
return TRUE;
if (watch->writefd.revents & WRITE_COND)
return TRUE;
return FALSE;
}
static gboolean
gst_rtsp_source_dispatch (GSource * source, GSourceFunc callback,
gpointer user_data)
{
GstRTSPWatch *watch = (GstRTSPWatch *) source;
GstRTSPResult res;
/* first read as much as we can */
if (watch->readfd.revents & READ_COND) {
do {
res = build_next (&watch->builder, &watch->message, watch->conn);
if (res == GST_RTSP_EINTR)
break;
if (res == GST_RTSP_EEOF)
goto eof;
if (res == GST_RTSP_ETGET) {
GString *str;
GstRTSPStatusCode code;
if (watch->funcs.tunnel_start)
code = watch->funcs.tunnel_start (watch, watch->user_data);
else
code = GST_RTSP_STS_OK;
/* queue the response string */
str = gen_tunnel_reply (watch->conn, code);
queue_response (watch, str, -1);
} else if (res == GST_RTSP_ETPOST) {
/* in the callback the connection should be tunneled with the
* GET connection */
if (watch->funcs.tunnel_complete)
watch->funcs.tunnel_complete (watch, watch->user_data);
} else if (res != GST_RTSP_OK)
goto error;
if (res == GST_RTSP_OK) {
if (watch->funcs.message_received)
watch->funcs.message_received (watch, &watch->message,
watch->user_data);
gst_rtsp_message_unset (&watch->message);
}
build_reset (&watch->builder);
} while (FALSE);
}
if (watch->writefd.revents & WRITE_COND) {
do {
if (watch->write_data == NULL) {
GstRTSPRec *data;
/* get a new message from the queue */
data = g_async_queue_try_pop (watch->messages);
if (data == NULL)
goto done;
watch->write_off = 0;
watch->write_len = data->str->len;
watch->write_data = (guint8 *) g_string_free (data->str, FALSE);
watch->write_cseq = data->cseq;
data->str = NULL;
g_slice_free (GstRTSPRec, data);
}
res = write_bytes (watch->writefd.fd, watch->write_data,
&watch->write_off, watch->write_len);
if (res == GST_RTSP_EINTR)
break;
if (res != GST_RTSP_OK)
goto error;
if (watch->funcs.message_sent && watch->write_cseq != -1)
watch->funcs.message_sent (watch, watch->write_cseq, watch->user_data);
done:
if (g_async_queue_length (watch->messages) == 0 && watch->write_added) {
g_source_remove_poll ((GSource *) watch, &watch->writefd);
watch->write_added = FALSE;
watch->writefd.revents = 0;
}
g_free (watch->write_data);
watch->write_data = NULL;
} while (FALSE);
}
return TRUE;
/* ERRORS */
eof:
{
if (watch->funcs.closed)
watch->funcs.closed (watch, watch->user_data);
return FALSE;
}
error:
{
if (watch->funcs.error)
watch->funcs.error (watch, res, watch->user_data);
return FALSE;
}
}
static void
gst_rtsp_rec_free (gpointer data)
{
GstRTSPRec *rec = data;
g_string_free (rec->str, TRUE);
rec->str = NULL;
g_slice_free (GstRTSPRec, rec);
}
static void
gst_rtsp_source_finalize (GSource * source)
{
GstRTSPWatch *watch = (GstRTSPWatch *) source;
build_reset (&watch->builder);
g_async_queue_unref (watch->messages);
watch->messages = NULL;
if (watch->notify)
watch->notify (watch->user_data);
}
static GSourceFuncs gst_rtsp_source_funcs = {
gst_rtsp_source_prepare,
gst_rtsp_source_check,
gst_rtsp_source_dispatch,
gst_rtsp_source_finalize
};
/**
* gst_rtsp_watch_new:
* @conn: a #GstRTSPConnection
* @funcs: watch functions
* @user_data: user data to pass to @funcs
* @notify: notify when @user_data is not referenced anymore
*
* Create a watch object for @conn. The functions provided in @funcs will be
* called with @user_data when activity happened on the watch.
*
* The new watch is usually created so that it can be attached to a
* maincontext with gst_rtsp_watch_attach().
*
* @conn must exist for the entire lifetime of the watch.
*
* Returns: a #GstRTSPWatch that can be used for asynchronous RTSP
* communication. Free with gst_rtsp_watch_unref () after usage.
*
* Since: 0.10.23
*/
GstRTSPWatch *
gst_rtsp_watch_new (GstRTSPConnection * conn,
GstRTSPWatchFuncs * funcs, gpointer user_data, GDestroyNotify notify)
{
GstRTSPWatch *result;
g_return_val_if_fail (conn != NULL, NULL);
g_return_val_if_fail (funcs != NULL, NULL);
g_return_val_if_fail (conn->readfd != NULL, NULL);
g_return_val_if_fail (conn->writefd != NULL, NULL);
result = (GstRTSPWatch *) g_source_new (&gst_rtsp_source_funcs,
sizeof (GstRTSPWatch));
result->conn = conn;
result->builder.state = STATE_START;
result->messages = g_async_queue_new_full (gst_rtsp_rec_free);
result->readfd.fd = -1;
result->writefd.fd = -1;
gst_rtsp_watch_reset (result);
result->funcs = *funcs;
result->user_data = user_data;
result->notify = notify;
/* only add the read fd, the write fd is only added when we have data
* to send. */
g_source_add_poll ((GSource *) result, &result->readfd);
return result;
}
/**
* gst_rtsp_watch_reset:
* @watch: a #GstRTSPWatch
*
* Reset @watch, this is usually called after gst_rtsp_connection_do_tunnel()
* when the file descriptors of the connection might have changed.
*
* Since: 0.10.23
*/
void
gst_rtsp_watch_reset (GstRTSPWatch * watch)
{
if (watch->readfd.fd != -1)
g_source_remove_poll ((GSource *) watch, &watch->readfd);
if (watch->writefd.fd != -1)
g_source_remove_poll ((GSource *) watch, &watch->writefd);
watch->readfd.fd = watch->conn->readfd->fd;
watch->readfd.events = READ_COND;
watch->readfd.revents = 0;
watch->writefd.fd = watch->conn->writefd->fd;
watch->writefd.events = WRITE_COND;
watch->writefd.revents = 0;
watch->write_added = FALSE;
g_source_add_poll ((GSource *) watch, &watch->readfd);
}
/**
* gst_rtsp_watch_attach:
* @watch: a #GstRTSPWatch
* @context: a GMainContext (if NULL, the default context will be used)
*
* Adds a #GstRTSPWatch to a context so that it will be executed within that context.
*
* Returns: the ID (greater than 0) for the watch within the GMainContext.
*
* Since: 0.10.23
*/
guint
gst_rtsp_watch_attach (GstRTSPWatch * watch, GMainContext * context)
{
g_return_val_if_fail (watch != NULL, 0);
return g_source_attach ((GSource *) watch, context);
}
/**
* gst_rtsp_watch_unref:
* @watch: a #GstRTSPWatch
*
* Decreases the reference count of @watch by one. If the resulting reference
* count is zero the watch and associated memory will be destroyed.
*
* Since: 0.10.23
*/
void
gst_rtsp_watch_unref (GstRTSPWatch * watch)
{
g_return_if_fail (watch != NULL);
g_source_unref ((GSource *) watch);
}
static GstRTSPRec *
queue_response (GstRTSPWatch * watch, GString * str, guint cseq)
{
GstRTSPRec *data;
/* make a record with the message as a string ans cseq */
data = g_slice_new (GstRTSPRec);
data->str = str;
data->cseq = cseq;
/* add the record to a queue. FIXME we would like to have an upper limit here */
g_async_queue_push (watch->messages, data);
/* FIXME: does the following need to be made thread-safe? (queue_response
* might be called from a streaming thread, like appsink's render function) */
/* make sure the main context will now also check for writability on the
* socket */
if (!watch->write_added) {
g_source_add_poll ((GSource *) watch, &watch->writefd);
watch->write_added = TRUE;
}
return data;
}
/**
* gst_rtsp_watch_queue_message:
* @watch: a #GstRTSPWatch
* @message: a #GstRTSPMessage
*
* Queue a @message for transmission in @watch. The contents of this
* message will be serialized and transmitted when the connection of the
* watch becomes writable.
*
* The return value of this function will be returned as the cseq argument in
* the message_sent callback.
*
* Returns: the sequence number of the message or -1 if the cseq could not be
* determined.
*
* Since: 0.10.23
*/
guint
gst_rtsp_watch_queue_message (GstRTSPWatch * watch, GstRTSPMessage * message)
{
GstRTSPRec *data;
gchar *header;
guint cseq;
g_return_val_if_fail (watch != NULL, GST_RTSP_EINVAL);
g_return_val_if_fail (message != NULL, GST_RTSP_EINVAL);
/* get the cseq from the message, when we finish writing this message on the
* socket we will have to pass the cseq to the callback. */
if (gst_rtsp_message_get_header (message, GST_RTSP_HDR_CSEQ, &header,
0) == GST_RTSP_OK) {
cseq = atoi (header);
} else {
cseq = -1;
}
/* make a record with the message as a string and cseq */
data = queue_response (watch, message_to_string (watch->conn, message), cseq);
return cseq;
}
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